If nothing else, Marine Sharpshooter 3 lives up to its billing. You play a Marine. You do a lot of sharpshooting. And that's about it. The box-cover blurb claims that this franchise has sold over a million copies, but it's hard to see how a game this dumb and derivative could ever develop a fan base. While the game isn't horrific looking, and there is a lot of shooting going on, all you do is stalk through linear levels sniping everything that moves. Retro shooter fans might enjoy this monotonous killing for an hour or so, then look for the uninstall icon.
Still, at least the game is topical. Marine Sharpshooter 3 kicks off with a Mahmoud Ahmadinejad soundalike at a press conference where he claims that Iran is no threat to the world and that "using nuclear weapons is against the rules of Islam." Uh-huh. It's a good thing that the US doesn't believe that nonsense because it turns out that the Iranians are both messing around with nukes and arming terrorists in nearby Iraq. So what starts as a recon mission where you're ordered not to engage the enemy unless absolutely necessary soon turns into a search-and-destroy crusade where you gun down everybody you see. "Absolutely necessary" actually comes into play right after receiving the above directive because you have to kill a half-dozen Iranian soldiers within a minute of starting the game. So much for the sanctions.